I think that people should get clear what is a rip off and what isn't. The kiss of the Berlin wall, first place, is not an ad. In second place, it's a painted reproduction of a photo that appeared in the newspapers at the end of the 70s, showing Breshnev and Honecker. Don't forget that in Russia men kiss in the mouth as a sign of respect:http://theinspirationroom.com/daily/2009/bruderkiss-in-berlin-wall-eas...

So, what the painting of the Berlin wall did was just to reproduce an existing photo.
What Dansu's ad is doing is to create a non-existent situation, to illustrate with a symbol the message that they want to communicate.

Personally, I wouldn't consider Dansu's ad a copy of the Berlin wall painting. If I do that, then I should consider also the Berlin Wall painting as a copy of the photo of the original historic kiss. And, as far as I know, advertising is allowed to copy real life.